Yes its true: In its two years of service, there are no viruses for MAC OS X Panther. That doesn't mean that there wont be, so using an antivirus on it, is still recommended.


First, the Mac OS X operating system is built on Unix, an industrial-strength operating system used in business, science and education. And OS X doesn't enable users -- or hackers who hijack user accounts -- to alter certain core files and features of its Unix underpinnings. By contrast, Windows XP users are given "full administrator" privileges that viruses and hackers can usurp to do damage.
read the whole article: http://ptech.wsj.com/archive/ptech-20031023.html

Panther has synced with FreeBSD 5, and has incorporated gcc 3.3 as its default compiler
Here's a review on the Panther OS: http://www.macwrite.com/criticalmass...d-mac-os-x.php